Last year (or does it still count as this year... oh, well 2003 is what I mean) me and two of my Brothers went to Daytona Beach for Spring Break. It was AWESOME! The past two years before that I went to Mexico, and this was WAY better. The clubs were smaller, but I like that, you can actually chill and meet people. The place was absolutely INSANE. It's like what college would be like if everyone lived there and nobody ever had class (the great American dream...). Some pics of our trip our on our website:
CLICK ME!
Check it out if you have the time... it's pretty funny. (note that all of us that went were 21, so the alcohol was legal

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We're going back next year but bringing a lot more of us (this year it was a last-minute spur-of-the-moment thing, we decided to go about 5 days before we left). Everything was pretty cheap too, the whole thing costed about $600, which included the room for a week, a rental car to drive down, gas, food, LOTS of alochol, and some spending money. I seriously recommend this for anyone who is a bit tight on money but still wants to go. I'm sure if you plan in advance and bring more people you could probably go for even a LOT cheap than we did!
Let me know if anyone is looking for more information, PM me!